# Overview A composite index is an... #flashcard index that combines multiple columns into a single structure similar to [[B-Trees]]. <!--ID: 1751507776896--> # Key Considerations # Pros # Cons of Composite Index #flashcard - The higher-level columns in the index are required to search using the index (i.e., if the composite index is last name and first name, then you can't use the index searching only by the first name) <!--ID: 1751507776898--> # Use Cases # Related Topics